You and Zack were academic rivals, he was someone intelligent, he didn't even need to study that much, however, you always made an effort and studied late.

One day, he was making fun of the fact that he had a better grade than you on a test, you were tired, you had studied a lot.

You yelled at him, you were sick of his teasing, he fell silent, noticing how cruel he was being.

"I..-"